In terms of gaming, which one of these laptops would be better?

[Gustavo48]

http://www.walmart.com/ip/Dell-Silver-15.6-Inspiron-15-5545-Laptop-PC-with-AMD-A10-7300-Processor-8GB-Memory-1TB-Hard-Drive-and-Windows-8.1/40100005



http://www.walmart.com/ip/Dell-Black-15.6-Inspiron-15-5555-Laptop-PC-with-AMD-A8-7410-Quad-Core-Processor-8GB-Memory-1TB-Hard-Drive-and-Windows-8.1/45711344




http://www.newegg.com/Product/Product.aspx?Item=9SIA4P02UY0895&cm_re=dell_inspiron_i5548-_-34-299-289-_-Product



I know these aren't the best gaming laptops, but since I'm getting a laptop for college, I figured I might get the best one for gaming in that budget. So which one do you guys recommend?
And also, I noticed that the last 2 links say that you can later upgrade to Windows 10. Anyone know if the laptop from the 1st link will be able to be upgraded to Windows 10 for free.

 

[velo3100]

This one is better: http://www.newegg.com/Product/Product.aspx?Item=9SIA4P02UY0895&cm_re=dell_inspiron_i5548-_-34-299-289-_-Product